netdev - Re: [PATCH net-next v2] net: ngbe: Add ngbe mdio bus driver.

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Date:   Sun, 11 Dec 2022 13:02:26 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     "mengyuanlou@...-swift.com" <mengyuanlou@...-swift.com>
Cc:     netdev@...r.kernel.org, jiawenwu@...stnetic.com
Subject: Re: [PATCH net-next v2] net: ngbe: Add ngbe mdio bus driver.

> > If you don't have the I2C bus, i'm wondering how you can actually
> > driver the SFP and the MAC. You have no idea what has been
> > inserted. Is it actually an SFF, not an SFP? Do you have any of the
> > GPIOs normally associated with an SFP? TX_DISABLE, LOS, TX_FAULT?
> > 
> 1、Yeah. We can't know what module is inserted

That is a very odd design. You are going to get all sorts of reports
of it being broken when some random module is interested.

If it was my design, i would not use an SFP socket. I would solder
down an SFF. They should be pin compatible. You then know exactly what
you have, and how the MAC needs to be configured.

      Andrew